DTC Advanced Diagnostics: P065A
DTC P065A:ACG No Charging Malfunction

General Description

Driven by the engine, the alternator generates electricity according to the commands from the powertrain control module (PCM). The local interconnect network (LIN) line is connected to the alternator and transmits/receives information to/from the PCM. The voltage regulator in the alternator self-diagnoses itself, and by the PCM demands, the results are transmitted via the LIN line. If the self-diagnosed results are judged as generation unable or alternator rotation stop, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
60 seconds or more
DTC Type
One drive cycle, MIL off

Enable Conditions
Condition
Minimum
Maximum
Engine speed
[ENGINE SPEED]
500 rpm
–
[ ]: HDS Parameter

Malfunction Threshold
Either one of the conditions is met for at least 60 seconds:
B terminal voltage is regulated voltage or more, and F terminal voltage is HIGH.
B terminal voltage is 10 V or less (when the alternator speed is 3,000 rpm or less), or 11 V or less (when the alternator speed is 3,000 rpm or more).
P terminal voltage is 2 V or less (when the alternator speed is 3,000 rpm or less), or 6 V or less (when the alternator speed is 3,000 rpm or more).
Alternator speed is 400 rpm or less.

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
Alternator internal failure (voltage regulator failure)
Alternator rotation defection

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory. The MIL does not come on.

Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.